Valve-gear.



,NO. 729,998. f IIATENTED JUNE 2, 1903.

I. s. BOSTWIGK. VALVE GEAR.

APPLIOATION 'IILED JUNE 6. 1902f H0 MODEL WITNESSES:

ATTORNEYS,

m: NORRIS PKT'ERS co. PHOTO-LKTHQ, WASHINGTON, u, c.

Nd. 729,998. PATENTBD JUNE 2, 190 3.. P. s. B OSTWIGK.

VALVE GEAR.

APBLIOATION FILED JUNE 6. 1902.

2 SHEETS-SHEET 2.

N0 MODEL.

gay/101M WITNESSES: INVENTOR Eu] D15 0.171022% I ATTORNEYS.

Patented June 2, 1903.

PATENT OFFICE.

PAUL S. BOSTWICK, OF WOODBINE, IOWA.

VALVE-G EAR.

- SPECIFICATION forming part'of Letters Patent No. 729,998, dated June 2,1903.

Applicatiohtilridduu 6 of Woodbine, in the countyof Harrison and State of Iowa, have invented aineww and Improved Yalve-Gear, of-which the followin'gis a full, clear, and exact description. 7

The invention relates to steam-engiriessuch, forinstance, as shown and described in the application for Letters Patent of the United States No. 105,983, filed by me on May 5, 1902. w 1 The object of the invention is to provide a new and improved valve-gear which is simple, and durable in constructiomyery effective in operation, actuated from the reciprocating cross-head, and arranged to permit minute adjustment of the cut-off mechanism to'run the engine as economically as possible.

The invention consists ofnovel features and parts and combinations of-t-he same, as will be more fully described hereinafterand then pointed out in the claims. A practical embodiment of the invention is represented in the accompanying drawings, forming a part of this specification, in which .similar characters of reference indicate cor-' responding parts in all the views.

Figure l is a side elevation of the improve ment as applied. Fig. 2 is aplan viewof the same.

ing on the line 3 3 of Fig. 1. Fig. 4 is a sec-z tional plan view of the improvement as applied, and Fig. 5 is a cross-section of the same on the line 5 5 of Fig. 4c.

The engine on which the valve-gear is applied is provided with the cylinder A, in which reciprocates the piston B, connected by the piston-rod O with the cross-head D, having the usual pitman connection with the main shaft of the engine or having a connection with the shaft, such as described in the application for Letters Patent above referred to.

The cylinder A is provided with the usual admission-ports Ct 19 and the exhaust-port 0, opening into the valve-chamber E, containinga rock-valve F, having cut-out portions (1 d at opposite sides, and the said valvechamber E is connected on opposite sides by ports 0 c with anadmission-chamber G, con nected by a port f with the steam-chest or Fig. Sis a cross-section of part of the cutoff-adjusting mechanism, the section be-:

1902. Serial No. 110,458. (No model.)

receiving-chamber H, connectedby the pipe The stem F of the rock-valve F is provided at its outer end with a crank-arm F having its wrist-pin F alternately engaged by the spaced shoulders F F of a slide F, rigidly the cross-head D. The other end of the slide gaged by a pin F attached to the cylinder, so

and backward movement with the cross-head D. Now when the cross-head D reciprocates a like movement is given to the slide F and the spaced shoulders]? F thereof impart a swingvalve F is rocked in the valve-chamber E. Now when the piston B is at the end of its inward stroke, as shown in the drawings, then the cut-out portion at connects the ports a and e with each other to allow live steam to pass into the inner end of the cylinder to push the piston on its ontwardstroke. The steam in frontof the piston passes by way of the port l; and cut-out portion (1 into the exhaust-port c and the usual exhaust-pipe which ;.carries the exhaust-steam to the outside air orto a condenser, as the case may be. When the piston B nears the end of its outward stroke, then the shoulder F moves in engagement ,with the pin E to impart a rocking moowith each other .by the cut-out portion d and to connect the port b 'withthe port e, so

.outer end of the cylinder A- topush the piston B on its inward stroke.

The amount of motive agent passing from the receiving-chamber H by way of the port f into the admission-chamber Gis controlled by a cut-01f valve J, having two ports 9 and g alternately connecting with the port f on reciprocating the valve-J. Thelatterhas its valve-stem J extending through a suitable stufling-box to the outside of the chamber H,

otally connected with a lever K,ghavin g an extension K connected by-a link K with the bracket D of the cross-head D.

The lever K is slidably engaged by a guideway L, having a pivot-pin L engaged by an connected at one end with. the bracket D of tion to the valve F to connect the ports a and I with a boiler or other suitable source of sup- F? is formed with an elongated slot F en' as to properly guide the slide inits forward mg motion to the crank-arm F so that the that live motive agent now passes into the and the outer end of this valve -stemJ is pivarm N extending longitudinally and fulcrumed at N on the chamber H, (see Fig. 1,) and the said pivot L is connected by a link with a hand=lever P under the control of the operator and adapted to be locked in any position to the fixed quadrantQ. Now when the cross-head D reciprocates then the bracket D, by the link K imparts a swinging motion to the lever K, the latter turning, with its guideway L, on the pivot-pin L, held in position by the arm N and link 0. Now this rocking motion of the lever K causes a reciprocating of the stem J and cut-0E valve Jto move the ports g g alternately in register with the port f.

When it is desired to reduce the amount of motive agent passing through the registering ports g f and gf from the chamber H into the admission-chamber G, then the operator swings the hand-lever P in the direction of the arrow (1, (see Fig. 1) to cause the link 0 to pull on the pivot L, so that the guideway L moves up on the lever K to bring the pivotpin nearer to the pivot of the valve-stem J, so that the rocking motion of the lever K is diminished, and consequently the travel of the cut-oil? valve J is reduced to cause the ports 9 g to register but partly with the port f. By moving the hand-lever P into a horizontal position in the direction of the arrow at the pivot-pin L is brought in transverse alinement with the pivotal connection of the stem J with the lever K, so that no movement is given to the slide-valve J, and the lat ter stands then in a closed positionthat is, both ports g g are out of register with the port f.

By the arrangement described the cut-0E of the motive agent can be controlled by the operator to the minutest degree to run the engine as economically as possible relative to the consumption of the motive agent.

Having thus described my invention, I claim as new and desire to secure by Letters Patent- 1. In a valve-gear, a valve-chamber, a valve in said chamber and controlling the admission and exhaust ports, means for operating the valve from the cross-head of the engine, a receiving-chamber connected with the motive agent supply, an admission chamber communicating with the receiving-chamber and the valve-chamber, a valve controlling the admission of the motive agent from the receiving to the admission chamber, means for operating said valve from the cross-head of the engine, and means under the control of the operator for regulating the throw of the said valve, as set forth.

2. In a valve-gear, a steam-chest having a receiving-chamber connected with the motive-agent supply, a valve-chamber, an admission-chamber between the valve-chamber and receiving-chamber and having a port opening into the said receiving-chamber, and ports on opposite sides and leading to the valve-chamber, a rock-valve in the valvechamber and having cut-out portions at opposite sides, and a sliding cut-oft Valve for the port leading to the admission-chamber from the receiving-chamber, as set forth.

3. A valve-gear comprising a steam-chest having a receiving-chamber connected with the motive-agent supply, a valve-chamber, an admission-chamberhavingaport opening into the said receiving-chamber, ports leading to the valve-chamber, a rock-valve in the said valve-ahamber,controlling the admission and exhaust of the motive agent to and from the cylinder, a cut-off valve for the port, leading to the admission-chamber from the receivingchamber, the said cutoff valve having two spaced ports for alternate connection with the said admission-chamber port, and means for imparting a reciprocating motion to the said cut-01f valve from the cross-head of the engine, as set forth.

4. A valve-gear comprising a steam-chest having a receiving-chamber connected with the motive-agent supply, a valve-chamber, an admission-chamber having a port opening into the said receiving-chamber, ports lead ing to the valve-chamber, a rock-valve in the said valve-chamber, controlling the admission and exhaust of the motive agent to and from the cylinder, a cut-on valve for the port, leading to the admission-chamber from the receiving-chamber, the said cutoff valve having two spaced ports for alternate connection with the said admission chamber port, means for impartinga reciprocating motion to the said cut-off valve from the crosshead of the engine, and means for regulating the throw of the said cut-01f valve,as set forth.

5. A valve-gear provided with a cut-ofl": valve, a' lever pivotally connected with the stem of the said cut-01f valve, a connection between the said lever and the cross-head of the engine, a guideway slidably engaging the said lover, a pivot carried by the said guideway, an arm engaging the said pivot and having a fixed fulcrum, and a cut-off lever connected with the said; pivot, as set forth.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

PAUL S. BOSTWICK.

WVitnesses:

J. H. BRYANS, H. M. BOSTWICK. 

